Brief [an Rudolf Lipschitz]
Helsinki, 08.10.1878 [8 October 1878]Brief an College [Rudolf Lipschitz]
Stockholm, 11.10.1883 [11/X 1883]Brief an College [Rudolf Lipschitz]
Stockholm, 10.04.1887 [10./4. 1887]Brief an College [Rudolf Lipschitz]
Ängelsberg, 11.08.1890 [11/8 1890]Brief an College [Rudolf Lipschitz]
Stockholm, 16.10.1900 [16/10 1900]Brief an collegue [Rudolf Lipschitz]
Paris, 19.06.1892 [19 Juin 1892]